Koh Samet is a small island in Rayong province, around 200 km Southeast of Bangkok, along the way to Trat province and the island of Koh Chang. Technically part of Khao Laem Ya - Koh Samet National Park, Koh Samet is a popular weekend getaway for Thais and foreigners living in Bangkok, so there are dozens of beach resorts, bars, and restaurants on nearly every beach, although visitors are allowed to camp if they wish to do so.
Quiet and relaxing on the weekdays, raucous and fun on the weekends, Koh Samet is, despite its proximity to Bangkok, a beautiful island with powdery white sand, generally great year round weather, and a variety of lodging options.
Koh Samet derives its name from the cajeput trees that grow on the island, called “samet” in Thai. In the past however, it was called Koh Kaew Phitsadan, the "Magic Crystal Island". It’s no surprise from that name that Koh Samet was chosen to be part of a national park.
Visitors to Koh Samet looking for unspoiled beauty have to get away from the more developed beaches along the east coast, though even the most popular beaches are quite beautiful. Those looking for more relaxation can book rooms at the more upscale resorts on the west coast, which are spectacular places to watch sunsets.
Koh Samet is a small island around 200km south-east of Bangkok and just over 5 km off the coast of Rayong province. The island is part of the Khao Laem Ya – Koh Samet National Park though all of Koh Samet’s beaches have been developed to cater to the large stream of Bangkok residents who flock to the island each weekend. Drawn by its 14 fine, white sand beaches that feature a number of beachside bars and restaurants, Thai and foreign visitors return again and again to Koh Samet to enjoy the excellent weather on the island and appreciate its great natural beauty, home to exotic wildlife species including monkeys, hornbills, gibbons, and butterflies.
- Aow Khiw Nah Nok ( Khiw Nah Nok bay) has fine white sand, a prefect nature , no crowded and if the visitors would like to visit Sunset and Sunrise they can go to the view point at Aow Khiw Nah Nai it's distant fro,m Aow Khiw Nah Nok about 100 metre.
Make sure that you wear mosquito repellent around dawn and dusk as it is possible to contract Dengue Fever on the island.
Find out hotels in Koh Samet here
Thank you some info from TTT and other websites on internet.